Clean the cauliflower, cut out the hard stalk so that the head does not fall apart. Wash cauliflower. In a large pot, boil up plenty of salted water with milk and lemon juice. Add the cauliflower (cabbage must be covered with water), if necessary weight down with a skimmer and cook for 15-17 minutes.
Dice butter and melt slowly in a pot. Wash the chervil, shake dry. Pluck the leaves from the stems and chop them, except for a little bit for garnishing. Remove butter from the stove, pour through a fine sieve and let it cool down a little. Beat the egg yolks and white wine over a hot water bath until frothy. Gradually fold in the liquid butter. Stir in chervil, season with sugar, salt and pepper
Remove the cauliflower, drain, serve with sauce and garnish with the remaining chervil